Prediction and prevention of inconsonant deformation between face and body of concrete-faced rock-fill dam

摘要

During the construction of concrete-faced rock-fill dam (CFRFD) as Tianshenqiao hydraulic power station, a space occurred between the face and body of the dam, which threatened the safety of the dam. Researches are leaded to find out the reason of the phenomenon, as well as prediction and prevention methods. In this study, three-dimensional nonlinear FEM simulation is conducted for a concrete-faced rock-fill dam with 139 m in height, considering material distribution, construction sequence and loading process etc. The deformation and stress of the dam are analyzed, especially focused on the inconsonant deformation between face and body of the dam. Numerical simulation results show that the deformation of concrete face cannot keep up with that . of body, which results in a space occurring between face and under-layer. Further analysis show that the space between face and body is influenced by the material distribution, construction sequence and loading process of the dam. The phenomenon of inconsonant deformation between face and body may occur when the face construction process is divided into several parts. Finally, prediction and prevention methods are put forward based on the analysis. Several measures to prevent and cure the phenomenon are proposed.